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Employee Benefit Plans (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 15.00%    
Defined Contribution Plan, Employer Contributions, Vesting Period 5 years    
Defined Contribution Plan, Cost Recognized $ 538,000 $ 445,000 $ 445,000
Defined Benefit Plan, Benefit Obligation 8,084,000    
Defined Benefit Plan, Net Periodic Benefit Cost $ (39,000)    
Defined Benefit Plan, Percentage of Plan Funded 80.00% 79.90%  
Defined Benefit Plan, Contribution Percentage 5.00%    
Defined Benefit Plan, Benefits Paid $ 238,000    
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 482,000    
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 490,000    
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 480,000    
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 481,000    
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 471,000    
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 2,263,000    
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year 0    
Change in Projected Benefit Obligation from Change in Projected Discount Rate 117,000    
Defined Benefit Plan, Accumulated Benefit Obligation 8,084,000    
Defined Benefit Plan, Plan Assets, Target Allocation, Long-term Growth, Percentage $ 97    
Defined Benefit Plan, Plan Assets, Target Allocation, Short-term Growth, Percentage 3.00%    
Accumulated Postretirement Benefit Obligation $ 405,000    
Minimum [Member] | Cash And Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 0.00%    
Minimum [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 40.00%    
Minimum [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 40.00%    
Minimum [Member] | Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 0.00%    
Maximum [Member] | Cash And Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 20.00%    
Maximum [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 60.00%    
Maximum [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 60.00%    
Maximum [Member] | Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 5.00%    
Supplemental Employee Retirement Plan, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 1,410,000 $ 1,427,000  
Pension and Other Postretirement Benefit Expense 121,000 122,000 124,000
Cash Surrender Value of Life Insurance 36,133,000 18,820,000  
Defined Benefit Plan, Net Periodic Benefit Cost 26,000 89,000 87,000
Multiemployer Plans, Postretirement Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost 54,000 48,000 17,000
Defined Benefit Plan, Contributions by Employer 54,000 $ 48,000 $ 17,000
Delaware Bancshares, Inc. [Member] | Supplemental Employee Retirement Plan, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 602,000    
Pension and Other Postretirement Benefit Expense 15,000    
Delaware Bancshares, Inc. [Member] | Director Fee Deferral and Continuation Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 413,000    
Pension and Other Postretirement Benefit Expense $ 1,000    
Delaware Bancshares, Inc. [Member] | Director Fee Deferral and Continuation Plan [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Payment Period 5 years    
Delaware Bancshares, Inc. [Member] | Director Fee Deferral and Continuation Plan [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Payment Period 15 years